JPH06225990A - Fitting structure of vibration-proof damper - Google Patents

Abstract

PURPOSE:To prevent vibration at the nearby position of the resonance point of a vibrating substance supported by springs and a damper while keeping the vibratory isolation. CONSTITUTION:In a vibration-proof structure connecting and supporting a washing drum 3 to the washing machine frame 1 through springs 8 and a damper 9, the base end thereof is rotatably supported at the washing machine frame 1 and a specified friction is given to it and further, a damper 9 provided with an eye bolt 15 at the front of rod 10 and bolts which is touchable to and also separable from the inner peripheral face of the eye bolt 15 with a specified distance are fixed to the washing drum 3 through brackets 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper mounting structure for supporting a vibrating body.

[0002]

2. Description of the Related Art A washing machine having a horizontal washing drum as a vibrating body is known as a vibrating body supporting structure.
As shown in FIG. 5, the washing drum 3 is supported by the supporting spring 8 with respect to the washing machine frame 1 so that the vibration of the washing drum 3 is not transmitted to the outside. A damper 90 is provided between the washing drum 3 and the washing machine frame 1 in order to prevent a large vibration when the number of revolutions passes through the resonance point of the washing drum 3 after the start-up such as during the dehydration operation. There is.

However, the damper 90 for suppressing the vibration (amplitude, displacement) at the resonance point in the relatively low speed rotation region is
In the high-speed rotation region, which is the steady region of the dehydration operation, as shown by the solid line in FIG. 6, the vibration transmissibility is increased by the damping action and friction, and the vibration during dehydration is relatively increased.

Therefore, the applicant of the present application, Japanese Patent Application No. 3-441.
In No. 90, the washing drum and the washing machine frame are connected by a double crank mechanism, and the displacement of the washing drum is regulated within a certain range in accordance with the turning radius of the crank of the double crank mechanism to provide vibration isolation. It has been proposed to prevent the resonance of the washing drum while securing it.

[0005]

However, in this case, the support spring expands and the washing drum is displaced downward depending on the weight of the laundry put in the washing drum. For this reason,
In consideration of this displacement, the crank radius of the double crank mechanism can be rotated even when the washing drum is lowered,
It is necessary to set it longer than the amount of displacement that regulates resonance, and therefore the displacement (amplitude) of the washing drum near the resonance point becomes large, and vibration and noise may not be properly reduced. There has occurred.

Therefore, the present invention has been made in order to solve such a problem, and is representative of a vibration isolation structure of a washing machine capable of suppressing vibration near the resonance point of a washing drum while ensuring vibration insulation. An object of the present invention is to provide a mounting structure of a vibration damping damper capable of achieving both vibration insulation in a high frequency region and suppression of vibration near a resonance point of a vibrating body.

[0007]

According to the present invention, in a vibration isolating structure for a vibrating body which is connected and supported by a frame by a spring and a damper, one end of the frame is rotatably supported and a predetermined friction is given, while The damper includes an end provided with a guide member, and an engagement member fixed to the vibrating body and capable of coming into contact with and separating from the guide member with a predetermined gap.

At least one of the guide member and the engaging member is provided with a buffer member.

[0009]

Operation: The vibrating body supported by the spring tends to swing greatly near the resonance point. However, in the vicinity of the resonance point, the engaging member abuts the guide member to expand and contract the damper, so that the displacement of the vibrating body is restricted by the damper and the resonance of the vibrating body is suppressed.

On the other hand, in a rotating region having a small amplitude other than the resonance point, a predetermined gap is provided between the guide member provided on the damper and the engaging member provided on the vibrating member, so that the vibrating member is only a spring. On the other hand, while being supported, the damper is supported at a predetermined angle by the friction applied to the base end and does not act, so that it is possible to ensure vibration insulation particularly in the high frequency region of vibration other than the resonance point.

Further, since the buffer member is provided on at least one of the guide member and the engaging member, it is possible to mitigate the impact when the guide member and the engaging member come into contact with each other, and suppress the generation of vibration and noise.

[0012]

EXAMPLE An example of the present invention is shown in FIGS.

1 to 3, reference numeral 1 denotes a washing machine frame which constitutes a washing machine. Inside the washing machine frame, a washing drum 3 is supported horizontally. Inside the washing drum 3, a motor 4
The washing tub 2 which is driven to rotate is supported by the washing tub 2
Rotates at different rotation speeds during normal washing and dehydration.

The motor 4 is attached to the outside of the washing drum 3, and rotation is transmitted to a pulley 7 attached to the rotating shaft of the washing tub 2 by a pulley 5 attached to the rotating shaft of the motor 4 and a belt 6.

The washing drum 3 is suspended obliquely from above by a pair of support springs 8 arranged on the left and right sides of the washing machine frame 1, and downward from two places on the left and right of the bottom portion of the washing drum 3 shown in FIG. Brackets 11 each formed of a plate-shaped member are provided so as to project toward the brackets 11.
As shown in FIGS. 2 and 3, the two brackets 11,
11 are projected in parallel with a predetermined interval.

A bolt 12 as an engaging member penetrates through the tip portions of the pair of brackets 11, 11, and the bolts 12 are fastened with a nut 13 so that the brackets 11,
Combine 11 Bolt 1 between brackets 11, 11
A collar 14 formed of an elastic member such as rubber is fitted as a cushioning member on the outer periphery of the member 2.

The bolt 12 for connecting the brackets 11 and 11 has a predetermined gap with the eye 15 as a guide member provided at the end of the rod 10 of the damper 9 which is erected on the bottom of the washing machine frame 1 as described later. The large displacement near the resonance point of the washing drum 3 is restricted by the eye 15 and the bolt 12 coming into contact with each other to expand and contract the rod 10, but in the rotation region where the displacement is small other than the resonance point. Allows free movement of drum 3, eye 15 and bolt 12
The vibration of the washing drum 3 is blocked from being transmitted to the washing machine frame 1 by the gap provided between the washing machine frame 1 and the washing machine frame 1.

The damper 9 is rotatably supported by giving a predetermined friction to a bracket 21 having a base end protruding from the bottom of the washing machine frame 1 through an eye 16. As shown in FIG. 3, the eye 16 is formed of a substantially cylindrical member and is fixed to the base end of the damper 9, and the inner periphery of the eye 16 is formed of an elastic member such as rubber in a cylindrical shape to prevent vibration applied to the damper 9. The relaxing bush 17 is fixed. A bolt 18 having one end locked through the bracket 21 penetrates through the central portion of the bush 17, and a nut 19 is attached to the other end of the bolt 18 through washers 20 arranged on both sides of the bush 17 in the figure. Is screwed, the damper 9 is given a predetermined friction by the bolt 18 via the eye 16 and the bush 17, and is rotatably supported, and the damper 9 is rotated in accordance with the displacement direction of the washing drum 3. You can Bush 1
Since 7 is in sliding contact with the washers 20 arranged on both sides, it is possible to hold the damper 9 at a predetermined standing angle by the friction between the bush 17 and the washer 20.

On the other hand, the tip of the rod 10 which freely extends and contracts from the free end of the damper 9 is formed of a cylindrical member having a predetermined inner diameter sufficiently larger than the outer diameter of the collar 14 fitted to the bolt 12. The eye 15 is attached in a direction orthogonal to the axis of the rod 10. This eye 15 is the bracket 1
1 and 11, and a bolt 12 and a collar 14 are inserted into the inner periphery of the eye 15 to insert the bracket 11 into the bracket 11.
Of the washing drum 3, that is, the displacement of the washing drum 3 or the rod 10
The inner periphery of the eye 15 and the collar 14 are engaged with each other in a detachable manner according to the displacement of the.

Since the inner diameter of the eye 15 is larger than the outer diameter of the collar 14 fitted to the bolt 12, there is a predetermined gap C between the outer periphery of the collar 14 and the inner periphery of the eye 15 as shown in FIG. This gap C is set such that the bolt 12 can expand and contract the rod 10 via the collar 14 and the eye 15 according to the amplitude near the resonance point of the washing drum 3, and at the time of dehydration, the bolt 12 and the collar 14 are provided. Does not contact the eye 15.

With the above construction, the operation will be described below.

In the drum type washing machine, the washing drum 3
Because of the unbalanced mass due to the unevenness of the laundry inside the washing machine, vibration is generated particularly with the rotation of the washing tub 2 during the spin-drying rotation, and this vibration displaces the washing drum 3.

When the washing drum 3 is supported only by the support spring 8 as shown in FIG. 6, the vibration transmissibility becomes maximum at the resonance speed of the motor 4, and the displacement (amplitude) of the washing drum 3 becomes maximum.

However, the eye 15 provided on the rod 10 of the damper 9 rotatably supported by the washing machine frame 1 receives the displacement of the washing machine drum 3 via the bolt 12 to expand and contract the rod 10 for resonance. By suppressing, the vibration transmissibility at the resonance rotational speed (frequency) can be significantly reduced.

That is, the washing drum 3 near the resonance point
Is largely displaced, and when this displacement is larger than the gap C, the bolt 12 of the bracket 11 is inserted through the collar 14 into the eye 1.
The rod 10 is expanded and contracted by contacting the inner circumference of the rod 5. Rod 1
A damping force is generated in the damper 9 by the expansion and contraction of 0, so that the vibration energy is absorbed by the damper 9 and the displacement of the washing drum 3 is suppressed.

Depending on the displacement (amplitude) of the washing drum 3, the bolt 12 may collide with the eye 15, but the bolt 1
Since the contact between the eye 2 and the eye 15 is performed via the collar 14, the generation of vibration and noise can be mitigated, and further, an elastic member is provided between the eye 16 and the bolt 18 at the base end of the damper 9. Since the formed bush 17 is interposed,
The transmission of vibrations from the damper 9 to the washing machine frame 1 is reduced.

On the other hand, although the washing drum 3 is displaced in a region having a small displacement (amplitude) other than the resonance rotation region of the washing drum 3, for example, the washing rotation region or the dehydration rotation region shown in FIG.
Since this displacement is smaller than the gap C provided between the inner periphery of the eye 15 and the outer periphery of the collar 14, the collar 14 freely displaces on the inner periphery of the eye 15 in accordance with the displacement of the washing drum 3 and the rod 10 moves. Does not stretch. Therefore, since the washing drum 3 and the damper 9 are almost in a non-contact state,
The vibration transmissibility of the washing drum 3 is almost the same as that supported only by the support spring 8, and the transmitted vibration can be made very small.

That is, the damping force can be automatically switched according to the rotation of the washing tub 2 so that the damper 9 acts only near the resonance point to suppress the vibration. Therefore, in the vibration characteristics of FIG. 6, it is possible to improve both the vibration at the resonance point and the vibration isolation at the time of dehydration as shown by the chain line.

The above-described automatic switching operation of the damper 9 can be universally performed regardless of increase / decrease in the amount of laundry. For example, when the amount of laundry increases, the weight of the laundry causes the support spring 8 to expand and the washing drum 3 to move downward.

At this time, the displacement amount of the washing drum 3 is the eye 1
5 is larger than the gap C between the inner circumference of the collar 5 and the outer circumference of the collar 14, the collar 14 contacts the eye 15 and the rod 10 of the damper 9 is contacted.
And the damper 9 contracts.

When the washing tub 2 starts to rotate and the washing drum 3 vibrates, the collar 14 integrated with the washing drum 3 via the bracket 11 and the like moves inside the circumference of the eye 15, and initially, The collar 14 comes into contact with the eye 15, and the rod 10 expands and contracts according to this abutment to change the length of the rod 10 of the damper 9. At the same time, since the damper 9 maintains the standing angle by the friction between the bush 17 and the washer 20 which are interposed in the eye 16 at the base end, if the abutment of the collar 14 and the eye 15 exerts a force larger than this friction, the bolt 9 The damper 9 rotates about 18 as an axis and is supported at a new standing angle.

Therefore, the damper 9 is automatically adjusted to a new length and a standing angle of the damper 9 in which the collar 14 and the eye 15 are less likely to come into contact with each other as the laundry increases. At this time,
The relationship between the vibration of the washing drum 3 associated with the rotation and the gap C is similar to the above-described relationship, and since the generation of the damping force is automatically switched according to the number of rotations, the suppression of the vibration near the resonance point. It is possible to improve both vibration isolation during dehydration.

FIG. 4 shows another embodiment, in which the collar 14 as the cushioning member is provided on the outer circumference of the bolt 12 in the above embodiment, but the cushion 30 formed by the cylindrical elastic member on the inner circumference of the eye 15 is shown. Is fixed as a cushioning member. This cushion 30 has the same bolts 12 as the above.
Impacts and vibrates when abutting on the eye 15.

Although the damper 9 is provided on the bottom of the washing machine frame 1 in the above embodiment, it may be provided on a side surface or the like, and the number of the dampers 9 provided depends on the displacement amount of the washing drum 3 or the like. It can be changed as appropriate.

In the above embodiment, the eye 15 as the guide member is provided on the rod 10 and the bolt 12 as the engaging member is provided on the bracket 11. However, although not shown, the eye 15 is provided on the bracket 11 and the bolt 12 is provided. The rod 10
May be provided on the bolt 12 as the engaging member.
Can be formed of a rod-shaped or tubular member or the like.

The mounting structure of the damper in the washing machine having the horizontal washing drum 3 has been described above, but the mounting structure is not limited to the horizontal drum type washing machine, and is connected to the frame by the spring and the damper. Any supported vibrator can be applied.

[0037]

As described above, according to the present invention, in the region where the displacement of the washing drum near the resonance point is large, the engaging member provided on the washing drum is supported on the washing machine frame via the guide member. The large displacement of the washing drum can be surely suppressed by driving, and in a region where the displacement of the washing drum is small other than the resonance point, a predetermined gap provided between the guide member and the engaging member causes washing with the damper. The drum is in a state of almost non-contact and has the effect of increasing vibration insulation and providing a washing machine with excellent quietness.In addition, the damper operates only near the resonance point, and the damper is used in other rotation ranges. Since it is not operated, the durability of the damper can be increased.

Further, since the buffer member is provided on at least one of the guide member and the engaging member, it is possible to reduce shock and vibration when the guide member and the engaging member come into contact with each other.

[Brief description of drawings]

FIG. 1 is a schematic structural diagram showing an embodiment of the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is also an enlarged view of a damper mounting portion.

FIG. 4 is an enlarged view of a damper mounting portion showing another embodiment.

FIG. 5 is a schematic structural diagram showing a conventional example.

FIG. 6 is a diagram showing a relationship between a vibration transmissibility and a rotation speed of a motor.

[Explanation of symbols]

 1 Washing Machine Frame 3 Washing Drum 8 Support Spring 9 Damper 10 Rod 11 Bracket 14 Color 15 Eye

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[Procedure amendment]

[Submission date] June 22, 1993

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

[Figure 6]

Claims (2)

[Claims] 1. An anti-vibration structure for a vibrating body connected and supported by a frame by a spring and a damper, wherein one end of the frame is rotatably supported and a predetermined friction is provided, while a guide member is provided at the other end. An anti-vibration damper mounting structure, comprising: a damper; and an engaging member that is fixed to the vibrating body and that can be brought into contact with and separated from the guide member with a predetermined gap. 2. The vibration damping damper mounting structure according to claim 1, wherein at least one of the guide member and the engaging member is provided with a cushioning member.